bugfix 548 / fix for invalid user token

[PhotoNomad0]

Describe what your pull request addresses

• [ ] also includes fix for selecting/copying text in scripture pane https://github.com/unfoldingWord/gateway-edit/issues/534

Test Instructions

• [ ] test with https://deploy-preview-611--gateway-edit.netlify.app/
• [ ] open the app - do login selecting save login. Close app.
• [ ] open app in another URL (such as https://release-v2-2-0--gateway-edit.netlify.app/) - do login selecting save login. Close app
• [ ] open the app again https://deploy-preview-611--gateway-edit.netlify.app/ - it should go direct to login screen since the previous saved token has been invalidated.

[codecov[bot]]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (c6612ba) 51.64% compared to head (a5aa5bc) 50.56%.

Files	Patch %	Lines
src/context/AuthContext.js	0.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #611 +/- ## =========================================== - Coverage 51.64% 50.56% -1.09% =========================================== Files 43 43 Lines 1336 1339 +3 =========================================== - Hits 690 677 -13 - Misses 646 662 +16 ```

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[PhotoNomad0]

LGTM, seems to work as it should. If you don't close the app before switching, come back, and make an edit, it throws an error but that is to be expected.

@kintsoogi Yes, there is a second part that will need to be done eventually to completely fix the issue: When there is 401 error on edit - the popup should tell you that you are no longer logged in and give you the option of going to login screen. But that may get complicated due to the warning about unsaved changes.